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A method for treating acrylic acid waste water and recovering sodium acetate

A technology of acrylic acid and sodium acetate, applied in chemical instruments and methods, separation/purification of carboxylic acid compounds, water pollutants, etc., can solve problems such as high acetic acid content, unsuitable biochemical methods, etc., achieve large amount of wastewater treatment, realize The effect of recycling

Active Publication Date: 2017-11-03
POTEN ENVIRONMENT GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The embodiment of the present invention discloses a method for treating acrylic acid wastewater and recovering sodium acetate, which is used to solve the problem that the content of acetic acid, acrylic acid and formaldehyde in acrylic acid wastewater is high and is not suitable for biochemical treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Initial index of acrylic acid wastewater: acetic acid content is 35476mg / L, formaldehyde content is 16465mg / L, COD Cr It is 108320mg / L, and the pH value is 5.8.

[0039] 1), get 2000ml acrylic acid waste water, be 10% H with mass fraction 2 SO 4 The pH of the solution was adjusted to 2.0.

[0040] 2) Distill the acrylic acid wastewater with adjusted pH value at 105° C. to obtain 1600 ml of fractions and 400 ml of distillation residue.

[0041] 3) Add 55g of water-soluble phenolic resin to the distillation residue, stir evenly, stick and solidify at 120°C for 120min, cool to room temperature in a desiccator, crush, soak in 1mol / L sodium hydroxide solution for 6h, wash with water To neutrality, dry to obtain heavy metal adsorption resin.

[0042] 4) Add 65.86 g of urea to the fraction, and after reacting for 6 hours, solids appear at the bottom, ie, urea-formaldehyde resin is formed, and filtered to obtain the first filtrate. Add 1.6 g of sodium bisulfite to the filt...

Embodiment 2

[0047] Initial index of acrylic acid wastewater: acetic acid content is 39023mg / L, formaldehyde content is 18511mg / L, COD Cr It is 125191mg / L, and the pH value is 4.5.

[0048] 1), get 2000ml acrylic acid waste water, be 10% H with mass fraction 2 SO 4 The pH of the solution was adjusted to 2.2.

[0049] 2) Distill the acrylic acid waste water with adjusted pH value at 100° C. to obtain 1600 ml of fractions and 400 ml of distillation residue.

[0050] 3) Add 251g of water-soluble phenolic resin to the distillation residue, stir evenly, stick and solidify at 200°C for 120min, cool to room temperature in a desiccator, crush, soak in 2mol / L sodium hydroxide solution for 6h, wash with water To neutrality, dry to obtain heavy metal adsorption resin.

[0051] 4) Add 148.1 liters of urea to the fraction, and after reacting for 6 hours, solids appear at the bottom, ie urea-formaldehyde resin is formed, and filtered to obtain the first filtrate. Add 3.2 g of sodium bisulfite to th...

Embodiment 3

[0056] Initial index of acrylic acid wastewater: acetic acid content is 45750mg / L, formaldehyde content is 21594mg / L, COD Cr It is 137740mg / L, and the pH value is 2.9.

[0057] 1), get 2000ml acrylic acid waste water, be 10% H with mass fraction 2 SO 4 The pH of the solution was adjusted to 2.1.

[0058] 2) Distill the acrylic acid wastewater with adjusted pH value at 105° C. to obtain 1800 ml of fractions and 200 ml of distillation residue.

[0059] 3) Add 116g of water-soluble phenolic resin to the distillation residue, stir evenly, stick and solidify at 180°C for 120min, cool to room temperature in a desiccator, crush, soak in 3mol / L sodium hydroxide solution for 6h, wash with water To neutrality, dry to obtain heavy metal adsorption resin.

[0060] 4) Add 259.1 g of urea to the fraction, and after reacting for 6 hours, solids appear at the bottom, ie, urea-formaldehyde resin is formed, and filtered to obtain the first filtrate. Add 5.4 g of sodium bisulfite to the fil...

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Abstract

The embodiment of the present invention discloses a method for treating acrylic acid wastewater and recovering sodium acetate, which includes the following steps: distilling the wastewater whose pH value is adjusted to 0.5-5 at 95-110°C, collecting fractions and distillation residues; The product is sticky and solidified with water-soluble phenolic resin, activated by alkali to make heavy metal adsorption resin; mix the distillate with urea, react for 3-24 hours, and filter to obtain the first filtrate, add NaHSO3 to it, react for 5-30 minutes, and filter to obtain the second filtrate Filtrate; use NaOH to adjust the pH value of the second filtrate to 7-9, electrodialysis to obtain a dense phase and a dilute phase; evaporate the dense phase to obtain a concentrated solution and a condensate with a specific gravity of 1.22-1.26, cool the concentrated solution, and separate treatment , to obtain sodium acetate crystals and a mother liquor; the mother liquor is repeated to the previous step until the mass fraction of sodium acetate in the final mother liquor is not higher than 30.6%. The COD removal rate of this method is above 94%, and the B / C is greater than 0.67.

Description

technical field [0001] The invention relates to the field of waste water treatment, in particular to a method for treating acrylic acid waste water and recovering sodium acetate. Background technique [0002] As an important industrial derivative of propylene, acrylic acid has been widely used. At present, acrylic acid is mainly produced by direct gas-phase oxidation of propylene in industry. The corresponding acrylic acid wastewater is generated during the production process. Pollutants in acrylic acid wastewater mainly include acid-containing organic wastewater, which comes from reaction water, absorption water, tail gas spray water, etc. The main pollutants are formaldehyde, acetic acid, acrylic acid, etc. [0003] At present, the methods for treating industrial wastewater mainly include direct incineration, wet catalytic oxidation and biochemical methods. Because the biochemical method uses the metabolism of microorganisms to treat organic matter in wastewater, it has...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C02F9/14C07C51/41C07C51/42C02F1/66C02F1/04C02F103/36C02F101/34
Inventor 乔瑞平杨映李海涛张伦梁蒋玮
Owner POTEN ENVIRONMENT GRP